Yogurt Bacteria Strain Cheat Sheet
| Bacterial Strain | Species Type | Primary Function in Yogurt | Effect on Milk During Fermentation |
|---|---|---|---|
| Streptococcus thermophilus | Thermophilic | Primary acidifier | Rapid lactose fermentation to lactic acid; initiates pH drop, promotes protein coagulation |
| Lactobacillus delbrueckii subsp. bulgaricus | Thermophilic | Flavor enhancer | Produces acetaldehyde and volatile compounds; contributes to tart flavor and creamier texture |
| Lactobacillus acidophilus | Probiotic | Health-promoting, acid-tolerant | Enhances probiotic value; supports gut flora; mild acid production and post-acidification |
| Bifidobacterium bifidum | Probiotic | Gut microbiota enhancer | Improves digestive health; less acid-tolerant; contributes mild flavor and viscosity |
| Lactobacillus casei | Mesophilic/Thermotolerant | Texture stabilizer | Enhances long-term texture and shelf stability; survives refrigeration well |
| Lactococcus lactis | Mesophilic | Adjunct culture | Adds mild buttery flavor (via diacetyl); enhances creamy mouthfeel |
| Lactobacillus rhamnosus | Probiotic | Immune and gut modulator | Boosts probiotic profile; may slightly acidify; known for resilience in gastrointestinal tract |
| Lactobacillus plantarum | Facultative | Antioxidant producer | Stabilizes final product, enhances antioxidant potential, contributes to microbial balance |
| Lactobacillus reuteri | Probiotic | Anti-inflammatory effects | Produces reuterin (antimicrobial compound); supports immune balance |
| Lactococcus cremoris | Mesophilic | Creamy flavor, adjunct | Produces CO₂ and diacetyl; smooth texture, mild acidity |
| Leuconostoc mesenteroides | Heterofermentative | Flavor and texture enhancer | Produces CO₂ and aromatic esters; contributes to light, airy yogurt texture |